I need to implement localization into my xamarin forms project.
I use latest version of xf.
I implemented my localization accordingly from this link
It works when I changed language on my phone, it shows other language which is ok.
PROBLEM:
How to add for example two buttons on my SettingsPage and to be able to switch between languages?
I added in my AssemblyInfo class only
[assembly: NeutralResourcesLanguage("en-US")]
And for example my Settings Page have two buttons (two languages - english and serbian)
<StackLayout>
<Label Text="Please choose language"
VerticalOptions="CenterAndExpand"
HorizontalOptions="CenterAndExpand" />
<StackLayout Orientation="Horizontal">
<Button Text="EN" Command="{Binding SwitchLanguageCommand}" CommandParameter="en-US"/>
<Button Text="RS" Command="{Binding SwitchLanguageCommand}" CommandParameter="sr-Latn-RS"/>
</StackLayout>
</StackLayout>
How can I change languages in the runtime?
In my ViewModel I just added the method which is refering to SwitchLanguageCommand:
public class SettingsViewModel
{
public SettingsViewModel()
{
SwitchLanguageCommand = new Command(async (culture) => await ChangeLanguage(culture));
}
private async Task ChangeLanguage(object culture)
{
CultureInfo myCulture = new CultureInfo(culture as String);
CultureInfo.DefaultThreadCurrentCulture = myCulture;
}
public ICommand SwitchLanguageCommand { get; set; }
}
Related
I am trying to make funcionality, to make larger text across whole application for user when he clicks a 'increase font size' button. Using MVVM, I have done it like this:
Increase font size button click
increase value of double field 'fontSize' which is binded to almost every text in layout
Update UI with new value after button click
However I don't know how to achieve this in Collectionview where I have got Binding in .xaml file, with some particular List (item is model class). The collectionview DataTemplate contains labels where I want to increase font size. Is there a way to do this without adding 'fontSize' field in my model class. If not how to update UI with 'new' List with increased font sizes.
I appreciate any help, tips and discussions.
Thank you.
You can create bindableproperty(fontsize) in your viewmodel and use Relative Binding so the label in Collectionview can change it's fontsize,code like:
ViewMode:
public class ColViewModel:BindableObject
{
public ObservableCollection<Student> students { set; get; }
public static readonly BindableProperty FontSizeProperty =
BindableProperty.Create("fontsize", typeof(int), typeof(ColViewModel), null);
public int fontsize
{
get { return (int)GetValue(FontSizeProperty); }
set { SetValue(FontSizeProperty, value); }
}
public ICommand IncreaseCommand { private set; get; }
public ColViewModel()
{students = new ObservableCollection<Student>();
getStudents();
fontsize = 24;
IncreaseCommand = new Command(() => {
fontsize++;
});
}
View:
<StackLayout>
<Label Text="This is a Title" FontSize="{Binding fontsize}"/>
<CollectionView ItemsSource="{Binding students}">
<CollectionView.ItemTemplate>
<DataTemplate>
<Label Text="{Binding Name}" FontSize="{Binding Source={RelativeSource AncestorType={x:Type local:ColViewModel}}, Path=fontsize}"/>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
<Button Text="Click to increase fontsize" Command="{Binding IncreaseCommand}"/>
</StackLayout>
Edit:
xmlns:local="clr-namespace:MyForms2.ViewModels"
I'm using the Partial Views feature of Prism 7.1 in Xamarin in which the ContentView can have its own ViewModel. The binding to the viewmodel is working fine. However, I would also like to set a BindableProperty. For example, I would like to set a Title property on the ContentView. If the ContentView does not have its own ViewModel the Binding works fine. If it does have its own ViewModel the binding never occurs.
MainPage.xaml
<controls:CustomContentView Title="My Custom View Title"
mvvm:ViewModelLocator.AutowirePartialView="{x:Reference self}"/>
CustomContentView.cs:
public static readonly BindableProperty TitleProperty =
BindableProperty.Create(
nameof(Title),
typeof(string),
typeof(CustomContentView));
public string Title
{
get => (string)GetValue(TitleProperty);
set => SetValue(TitleProperty, value);
}
CustomContentView.xaml:
<ContentView.Content>
<StackLayout>
<Label Text="{Title}" />
</StackLayout>
</ContentView.Content>
If I set a breakpoint on the Title's set method, it never gets hit and the Title in the Label control is never bound.
By using a Partial View your Binding Context is the ViewModel for the View not the View itself...
By setting the Label's text in the CustomContentView like:
<StackLayout>
<Label Text="{Binding Title}" />
</StackLayout>
This would expect to bind to something like:
public class CustomContentViewModel : BindableBase
{
private string _title;
public string Title
{
get => _title;
set => SetProperty(ref _title, value);
}
}
Since you're instead expecting the binding to pull from the code behind, the XAML would need to be something like:
<ContentView x:Class="AwesomeApp.Views.CustomContentView"
x:Name="self">
<StackLayout>
<Label Text="{Binding Title,Source={x:Reference self}}" />
</StackLayout>
</ContentView>
The code below shows a simple example of a CollectionView. I am not receiving the event for the SelectionChangedCommand. Can someone see what I am doing wrong?
btw, the complete source for this can be found on GitHub here.
MainPage.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:ControlDemo"
x:Class="ControlDemo.MainPage">
<StackLayout>
<CollectionView SelectionMode ="Single"
ItemsSource="{Binding Tags}"
SelectionChangedCommand="{Binding SelectedTagChanged}">
<CollectionView.ItemTemplate>
<DataTemplate>
<StackLayout>
<Label Text="{Binding .}" />
</StackLayout>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
</StackLayout>
</ContentPage>
MainPageModel.cs
public class MainPageModel : FreshBasePageModel
{
public override void Init(object initData)
{
Tags = new List<string>() { "A", "B", "C" };
base.Init(initData);
}
public List<string> Tags { get; set; }
public Command SelectedTagChanged
{
get
{
return new Command(() =>
{
});
}
}
}
Couple of things that worked at my side (additionally to the SelectionMode = Single):
Make sure your Command' signature is <object> at your PageModel and do any cast according to your needs (specially if your collection becomes more complex).
Also at your XAML you want to give your CollectionView a name and use the SelectedItem property.
SelectionChangedCommandParameter="{Binding SelectedItem, Source={x:Reference cvTagsCollectionView}}"
I use your code and created a demo on my side, I add the widthRequest and HeightRequest to make the collectionView work:
<CollectionView
HeightRequest="170"
WidthRequest="200"
SelectionMode="Single"
SelectionChangedCommand="{Binding SelectedTagChangedCommand}"
ItemsSource="{Binding Tags}"
>
The SelectionChangedCommand did triggered after I click different items in the CollectionView.
I uploaded a sample here and you can check it: collectionView-selectItemChanged-xamarin.forms
If you want to use your ViewModel, then you should use the Binding for the SelectedItem:
<CollectionView ItemsSource="{Binding Monkeys}"
SelectionMode="Single"
SelectedItem="{Binding SelectedMonkey, Mode=TwoWay}">
...
</CollectionView>
and, in your ViewModel:
Monkey selectedMonkey;
public Monkey SelectedMonkey
{
get
{
return selectedMonkey;
}
set
{
if (selectedMonkey != value)
{
selectedMonkey = value;
}
}
}
So everytime you select a new object, the SelectedMonkey will be updated.
If you want to track the SelectionChanged, then, it should be in the code-behind (not sure how to implement within the viewmodel, nothing about that in the docs)
<CollectionView ItemsSource="{Binding Monkeys}"
SelectionMode="Single"
SelectionChanged="OnCollectionViewSelectionChanged">
...
</CollectionView>
And, in your Page.xaml.cs:
void OnCollectionViewSelectionChanged(object sender, SelectionChangedEventArgs e)
{
var previous = e.PreviousSelection;
var current = e.CurrentSelection;
...
}
I improved Fabricio P. answer in this way:
Used {RelativeSource Self} for SelectionChangedCommandParameter. It helps to omit named collection views.
So your xaml part will be something like this:
<CollectionView
ItemsSource="{Binding Objects}"
SelectionMode="Single"
SelectionChangedCommand="{Binding SelectObjectCommand}"
SelectionChangedCommandParameter="{Binding SelectedItem, Source={RelativeSource Self}}">
And in your view model:
public ICommand SelectObjectCommand => new Command<string>(i => { Debug.WriteLine("Selected: " + i); });
public IEnumerable<string> Objects { get; set; }
It doesn't look like you set the SelectionMode property. According to the docs:
By default, CollectionView selection is disabled. However, this behavior can be changed by setting the SelectionMode property value to one of the SelectionMode enumeration members:
None – indicates that items cannot be selected. This is the default value.
Single – indicates that a single item can be selected, with the selected item being highlighted.
Multiple – indicates that multiple items can be selected, with the selected items being highlighted.
Adding SelectionMode = Single to the CollectionView will resolve your problem.
if you are using the Model for it you can use the following method
My C# Model View Class
public class MainView : INotifyPropertyChanged
{
public ICommand SelectionChangedCommands => new Command<GroupableItemsView>((GroupableItemsView query) =>
{
GO_Account test = query.SelectedItem as GO_Account;
});
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void NotifyPropertyChanged([CallerMemberName] string propertyName = "")
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
And this is my XAML
<CollectionView x:Name="myAccounts"
SelectionMode="Single"
ItemsSource="{Binding Products}"
SelectionChangedCommand="{Binding SelectionChangedCommands}"
SelectionChangedCommandParameter="{Binding Source={x:Reference myAccountsModel}}">
</CollectionView>
Creating a Registration page, I need to get the following data from user.
First Name
Last Name
Username
Email
Password
Date of Birth
Gender
User Role
For the last two parameters, I am unable to find how to use radio buttons in Xamarin.Forms. Following is my code for the Registration Page.
<StackLayout BackgroundColor="#30af91" Padding="60">
<Entry Text="{Binding FirstName}" Placeholder="First Name"/>
<Entry Text="{Binding LastName}" Placeholder="Last Name"/>
<Entry Text="{Binding UserName}" Placeholder="Last Name"/>
<Entry Text="{Binding Email}" Placeholder="Email" />
<Entry Text="{Binding Password}" Placeholder="Password" IsPassword="True"/>
<Entry Text="{Binding ConfirmPassword}" Placeholder="Confirm Password" IsPassword="True"/>
<DatePicker MinimumDate="1/1/1948" MaximumDate="12/31/2007"/>
<!--Radio buttons for Gender
1. Male 2.Female-->
<!--Radio Buttons for UserRole
1. Admin 2.Participant-->
<Button Command="{Binding RegisterCommand}" Text="Register"/>
<Label Text="{Binding Message}" />
</StackLayout>
Xamarin forms does not provide Radio Button.
You can either use
1)Switch
2)Picker
or any other component to fulfill your requirement
UPDATE
The xamarin forms update version 4.6 has introduced the Radio button control, Here is the official documentation
I think there is a simpler solution that is fairly easy and requires no libraries. Really a a radio group is just a fancy ListView. You would just need to create a viewModel for each radio button that has a IsSelected flag and switch between 2 images. I had a need to allow a user to select how long a token persisted:
XAML
<ListView
HasUnevenRows="True"
HorizontalOptions="FillAndExpand"
ItemsSource="{Binding Durations}"
ItemSelected="ListView_ItemSelected"
SelectedItem="{Binding SelectedDuration}">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout
Orientation="Horizontal">
<Image
HeightRequest="18"
IsVisible="{Binding IsSelected}"
Source="radioButtonChecked.png"
WidthRequest="18"/>
<Image
HeightRequest="18"
IsVisible="{Binding IsUnselected}"
Source="radioButtonUnchecked.png"
WidthRequest="18"/>
<Label
Margin="8,0,0,0"
Text="{Binding Caption}"/>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
We create a listview in our content page and listen for the ItemSelected event. Each list item is a horizontal stack panel where we flip between two images depending on the selected state
Code Behind
public partial class LoginPage : ContentPage
{
LoginPageViewModel LoginPageViewModel { get; }
public LoginTwoFactorFrequencyPage ()
{
BindingContext = LoginPageViewModel = new LoginPageViewModel();
InitializeComponent ();
}
private void ListView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
LoginPageViewModel.UpdateSelected(e.SelectedItem as PersistenceDuration);
}
}
The page's code behind instantiates a view model and calls an UpdateSelected method with the newly selected item on the page's view model*
RadioButton ViewModel
The view model for each radio button:
public class PersistenceDuration : ViewModelBase
{
bool isSelected;
public string Caption { get; set; }
public TwoFactorTokenPersistenceDuration Duration { get; set; }
public bool IsSelected
{
get => isSelected;
set
{
isSelected = value;
OnPropertyChanged();
OnPropertyChanged("IsUnselected");
}
}
public bool IsUnselected => !IsSelected;
public PersistenceDuration(string caption, TwoFactorTokenPersistenceDuration duration)
{
Caption = caption;
Duration = duration;
IsSelected = false;
}
}
The radio button view model holds selection info and the caption. We make sure to fire OnPropertyChanged whenever the selected state changes
Page ViewModel
public class LoginPageViewModel : ViewModelBase
{
PersistenceDuration duration;
PersistenceDuration selectedDuration;
public ObservableCollection<PersistenceDuration> Durations { get; }
public PersistenceDuration SelectedDuration
{
get => selectedDuration;
set
{
if (value != null)
{
duration = value;
UpdateSelected(duration);
}
OnPropertyChanged();
}
}
public LoginTwoFactorFrequencyViewModel()
{
Durations = new ObservableCollection<PersistenceDuration>(
new List<PersistenceDuration>()
{
new PersistenceDuration(AppResources.Save_code__forever, TwoFactorTokenPersistenceDuration.Forever),
new PersistenceDuration(AppResources.ChatRequireEvery30Days, TwoFactorTokenPersistenceDuration.ThirtyDays),
new PersistenceDuration(AppResources.ChatRequireEveryLogin, TwoFactorTokenPersistenceDuration.None),
});
}
public void UpdateSelected(PersistenceDuration persistenceDuration)
{
foreach (var item in Durations)
item.IsSelected = persistenceDuration == item;
}
}
In the page view model we create a list of radio button view models that the XAML binds to. When we UpdateSelected() all the IsSelected states are updated which trigger binding updates which flip the image.
You will still need to do something about the highlight when someone selects an item, but that is easy enough to find on the internet :)
You can use XLabs plugin from manage NuGets package. After installing you can use like this:
In Xaml:
controls:BindableRadioGroup x:Name="Radiobtn"
In C#:
string[] gender = {"MAlE","FEMALE"}
Radiobtn.Add(gender)
Refer Link
https://github.com/XLabs/Xamarin-Forms-Labs/tree/master/samples/XLabs.Samples/XLabs.Samples/Pages/Controls
You can get the radio button effect without a package. Use Labels with text unicode circle \u26AA or \u25CB. Attach a tab gesture recognizer to each label.
When tapped, change the text of the selected button to unicode circle bullet \u29BF and change the text of the other button(s) back to unicode circle \u26AA.
Test on your preferred platforms as each platform may display somewhat differently. You may need to adjust the font size as you change the text.
If you want real radiobuttons you can xlabs their package (https://github.com/XLabs/Xamarin-Forms-Labs/tree/master/src/Forms/XLabs.Forms/Controls/RadioButton)
Personally I'd just use a picker, Xlabs package hasn't been updated in a while so their might be some bugs in the radiobutton
You can use image as a radio button. When tou you click on it, it can change. It is not a good way to do it though.
This is xaml code:
<Image Scale="0.7" HorizontalOptions="Start" x:Name="radioButton" Source="unRadioBtn.png">
<Image.GestureRecognizers>
<TapGestureRecognizer Tapped="radioButton_Clicked"></TapGestureRecognizer>
</Image.GestureRecognizers>
</Image>
And this is .cs:
private void radioButton_Clicked(object sender, EventArgs e)
{
radioButton.Source = "radioBtn.png";
}
Xamarin.Forms 4.6 introduced a new RadioButton control. You can find the documentation here: https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/radiobutton
You can use the switch component. Also you can see the implementation for a checkbox component from the XLabs project which is now discontinued, get the code and modify it as you need.
Hint: You're gonna need the custom renderers per platform for it to work .
You need to use Picker
https://developer.xamarin.com/api/type/Xamarin.Forms.Picker/
Actually it is the best alternative to RadionButton On Xamarin.forms
XLabs RadioButton and BindableRadioGroup work well: XLabs RadioButton for Xamarin Forms
Here's a simple Yes/No radio using the BindableRadioGroup:
var answers = new List<string>();
answers.Add("Yes");
answers.Add("No");
var RadioGroup = new XLabs.Forms.Controls.BindableRadioGroup()
{
ItemsSource = answers,
Orientation = StackOrientation.Horizontal
};
Xamarin Forms now provides a Radio Button control.
See docs here:
https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/radiobutton
As of XF 4.8 this is still experimental and I've not yet used this feature so can't comment on its stability.
How can I remove item form ListView in Xamarin Cross Platform Forms
<ViewCell.ContextActions>
<MenuItem Text="Delete" IsDestructive="True" Command="Binding DleteItemCommand}" />
</ViewCell.ContextActions>
But I want user code complies with MVVM pattern.
So, View model is just for presentation layer, you need interact with your cell instead of viewmodel. Follow the next steps:
1.Create a Observable collection of ViewModels for Cells.
2. Add this collection to ItemSource of ListView.
3. Then for command add callback method
<ListView x:Name="citiesListView" ItemTapped="OnSelection">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.ContextActions>
<MenuItem Clicked="DeleteAction" Text="Delete" IsDestructive="true" CommandParameter="{Binding .}" />
</ViewCell.ContextActions>
<StackLayout Padding="15,0">
<Label
Text="{Binding .}"
FontSize="30"
VerticalTextAlignment="Center"
HorizontalTextAlignment="Center"/>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
Then in code:
public partial class YourPage : ContentPage
{
public ObservableCollection<string> YourCollection { get; set; }
public YourPage()
{
InitializeComponent();
// initialize at this point
YourCollection = new ObservaleCollection(<Some collection of view models>);
citiesListView.ItemsSource = YourCollection;
}
private void DeleteAction(object sender, System.EventArgs e)
{
var menuItem = ((MenuItem)sender);
var yourViewModel = (YourViewModelType) menuItem.CommandParameter;
YourCollection.Remove(yourViewModel);
}
You can add ObservableCollection<YourType> and in command delete element from collection.
var collection = new ObservableCollection<YourType>();
yourList.ItemSource = collection;
// in Command
public void OnDelete (object sender, EventArgs e)
{
// getting reference on menu item
var menuItem = ((MenuItem)sender).CommandParameter;
// cast to underlying viewModel
var yourObject = (YourType)menuItem;
collection.Remove(yourObject);
}
Yes, it is compatible with MVVM pattern. So, you have a Cell in ListView and it is a single representation of viewModel. And using it is approach you have the next relationship: "model - viewModel - view". ObservableCollection has a references on ViewModels that you display in ListView's Cells, and you now can easily delete cells that you want. See improvements above in code